K 3–22: a D-type symbiotic star

Corradi, R. L. M.; Giammanco, C.

doi:10.1051/0004-6361/201015541

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…The errors in the quoted fluxes (relative to Hβ) for the other lines are ∼5% for lines stronger than 0.5 F Hβ , and are larger for fainter lines. The emission-line spectrum is for instance similar to that of the recently discovered D-type symbiotic star K 3-22 (Corradi & Giammanco 2010), but with stronger low-excitation forbidden lines such as…”

Section: Emission-line Spectrumsupporting

confidence: 60%

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The new carbon symbiotic star IPHAS J205836.43+503307.2

Corradi

Sabin

Munari

et al. 2011

A&A

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Aims. We are performing a search for symbiotic stars using IPHAS, the INT Hα survey of the northern Galactic plane, and follow-up observations. Methods. Candidate symbiotic stars are selected on the basis of their IPHAS and near-IR colours, and spectroscopy and photometry are obtained to determine their nature. We present here observations of the symbiotic star candidate IPHAS J205836.43+503307.2. Its velocity structure suggests an aspherical morphology. The near-infrared excess of the source, which was especially strong in 1999, indicated that a thick circumstellar dust shell was also present in the system. The carbon star has brightened in the last decade by two to four magnitudes at red and near-infrared wavelengths. Photometric monitoring during a period of 60 days from November 2010 to January 2011 reveals a slow luminosity decrease of 0.2 mag. Conclusions. From the observed spectrophotometric properties and variability, we conclude that the source is a new Galactic symbiotic star of the D-type, of the rare kind that contains a carbon star, likely a carbon Mira. Only two other systems of this type are known in the Galaxy.

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Section: Emission-line Spectrumsupporting

confidence: 60%

“…al. 2008, 2010a, 2010b, Corradi & Giammanco 2010, which more than doubles the number of systems previously known in the area covered by IPHAS. We present here a new detection, IPHAS J205836.43+503307.2 (l=90 • .19 b=+3 • .11), and the study of its spectroscopic and photometric properties.…”

Section: Introductionmentioning

confidence: 91%

The new carbon symbiotic star IPHAS J205836.43+503307.2

Corradi

Sabin

Munari

et al. 2011

A&A

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“…Could NGC 7380(4) be a symbiotic star? Based on the examples of well-studied and widely accepted symbiotic objects Belczyński et al (2000) adopted the following spectral criteria to classify an object as a symbiotic star: (i) the presence of absorption features of a late-type giant like TiO, H 2 O, CO, CN, or VO bands as well as CaI, CaII, FeI, or NaI absorption lines (ii) the presence of strong emission lines of HI and HeI and either emission lines of ions with ionization potential of at least 35 eV like [OIII] or high ionization lines from [FeVII]λλ5721, 6086, HeIIλλ4686, 5411 and CaVλ6086 (Corradi & Giammanco 2010) (iii) the presence of Raman scattered 6825Å emission feature. Schmid (1989) identified Raman scattered OVI lines (6825Å and 7082Å) in the spectra of symbiotic binaries, which are not observed in other astrophysical objects.…”

Section: Spectroscopy Of the Sourcementioning

confidence: 99%

Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380

Mathew

Banerjee

Ashok

et al. 2012

Res. Astron. Astrophys.

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We present a study of the star 2MASS J22472238+5801214 with the aim of identifying its true nature which has hitherto been uncertain. This object, which is a member of the young cluster NGC 7380, has been variously proposed to be a Be star, a D-type symbiotic and a Herbig Ae/Be star in separate studies. Here we present optical spectroscopy, near-IR photometry and narrow band Hα imaging of the nebulosity in its environment. Analysis of all these results, including the spectral energy distribution constructed from available data, strongly indicate the source to be a Herbig Ae/Be star. The star is found to be accompanied by a nebulosity with an interesting structure. A bow shock shaped structure, similar to a cometary nebula, is seen very close to the star with its apex oriented towards the photoionizing source of this region (i.e. the star DH Cep). An interesting spectroscopic finding, from the forbidden [SII] 6716, 6731Å and [OI] 6300 A lines, is the detection of a blue-shifted high velocity outflow (200 ± 50 km s −1 ) from the star.

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“…The description of the A&A 567, A49 (2014) photometric method adopted to select symbiotic star candidates was presented by Corradi et al (2008Corradi et al ( , 2010a, hereafter Papers I and II. Along with individual studies of other outstanding objects (Corradi & Giammanco 2010;Corradi et al 2010bCorradi et al , 2011, IPHAS and follow-up spectroscopy allowed us to discover fourteen new symbiotic stars in the 1800 square-degree IPHAS area (covering Galactic latitudes between −5 • and +5 • in the northern sky), where previously only eleven symbiotic stars were known. In these articles, we also emphasized the need for robust selection criteria to distinguish symbiotic stars from the most problematic mimics, and in particular from T Tauri stars and other young stellar objects (YSOs) that are much more frequent than symbiotic stars in the Galactic plane.…”

Section: Introductionmentioning

confidence: 99%

IPHAS and the symbiotic stars

Rodriguez-Flores

Corradi

Mampaso

et al. 2014

A&A

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Context. The IPHAS Hα survey provides a rich database to search for emission-line sources in the northern Galactic plane. Aims. We are systematically searching for symbiotic stars in the Milky Way using IPHAS. Our final goal, a complete census of this class of objects in the Galaxy, is a fundamental figure for discussing their overall properties and relevance to other classes of stars. Methods. Candidate symbiotic stars were selected using a refined combination of IPHAS and 2MASS photometric colours. Optical spectroscopy, together with the analysis of their spectral energy distribution in the IR, were obtained to confirm their nature and determine their main properties. Results. Five new symbiotic stars have been confirmed from spectroscopy at the 10.4 m GTC telescope. In one case, confirming the presence of a red giant star required near infrared spectroscopy. In another case, its symbiotic nature was adopted based on the strong similarity of its optical spectrum and spectral energy distribution to those of other genuinely symbiotic stars. The spectral energy distribution of the two S-types found is well fitted by red-giant model atmospheres up to 22 μm without evidence of IR excesses due to dust. In contrast, the three D-types mostly show emission from hot dust with a temperature around 1000 K. We also present the spectroscopic and photometric monitoring of the symbiotic star IPHASJ190832.31+051226.6 that was originally discovered in outburst, and it has now returned to a lower luminosity status. The spectra of thirteen other sources, all classified as young stellar objects except for a new compact planetary nebula, are also presented.Conclusions. The refinement of our discovery method, the completion of the IPHAS survey and photometric calibration, and the start of the twin survey in the south, VPHAS+, provide excellent perspectives for completing a reliable census of symbiotic stars in the Galaxy in the next few years.

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K 3–22: a D-type symbiotic star

Cited by 7 publications

References 14 publications

The new carbon symbiotic star IPHAS J205836.43+503307.2

The new carbon symbiotic star IPHAS J205836.43+503307.2

Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380

IPHAS and the symbiotic stars

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